The steps for Yingtong cashier software to open the receipt library are as follows:

1. Open Yingtong cashier software. Usually, the icon of the software can be found on the computer desktop or in the start menu, and you can double-click the icon to open it.

2. Log in to the management interface of the software. According to your permissions and role settings, enter the corresponding user name and password to log in.

3. On the main interface of the software, look for or find an option or button containing "receipt", "collection" or similar terms. These options are usually placed in the navigation bar, menu bar or toolbar.

4. click the "receipt" option or the corresponding button to enter the receipt management interface.

5. In the receipt management interface, you can see the list of created receipts or search for specific receipts. This interface usually provides functions such as creating, editing, deleting and querying.